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The Average Width of a Single Turn Lane, to the nearest whole foot, for the Primary Direction of traffic.
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This value represents the total width of all left-turn lanes associated with the primary or secondary direction of travel. Left-turn lanes are typically located in the median of the roadway and can include both left-turn deceleration/storage lanes and leftturn acceleration lanes. Segment breaks are made at the start point for left-turn lanes where the roadway completes its taper and the vehicle has full use of the lane(s) and at the end point where the return roadway width taper begins. No additional segment breaks are needed to specify the beginning or ending point of a left turn lane if it originates or terminates at an intersection or access point. Two-way left-turn lanes (TWLTL) are coded as a median type and are not quantified as left-turn lanes, even though irectional left-turn lanes may be striped within them for intersections or other access locations.
Input: Numeric in whole feet, default = 0 feet
• The left-turn lane width is measured from the edge of the through lanes to the edge of the
shoulder (if present), to the median, or to the opposing lane of traffic (if no median width is
present).
• Any width striped as no-vehicle travel is to be included in this width.
• If the left-turn lane is bounded on both sides by raised-curb median, only the driving surface
width is to be included in this width.
• Two-way left-turn lanes are coded as a median type, not left turn lanes.